/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns the previous parent of an element prior to a reparent operation
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) GetPreviousParent ( const [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) & InKey ) const